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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2904) Investigate the performance effect of adding an index to the Derby jar files (derby.jar, etc.)
Date Thu, 05 Jul 2007 21:34:04 GMT
Investigate the performance effect of adding an index to the Derby jar files (derby.jar, etc.)
----------------------------------------------------------------------------------------------

                 Key: DERBY-2904
                 URL: https://issues.apache.org/jira/browse/DERBY-2904
             Project: Derby
          Issue Type: Improvement
          Components: Performance
            Reporter: Daniel John Debrunner
            Priority: Minor


Since JDK 1.3 the Java jar format has supported an index to speed up class loading. Sounds
like it would be useful for derby's jar file, especially derby.jar with its many classes.
The ant jar target has an index attribute to enabled the index.

Would be interesting to see the performance benefit and the increased size of the jar files.

As a thought for a performance test, a simple test that loaded Derby in separate class loaders,
opened an existing database and executed a query to load as many classes as possible.

 for (number of iterations)
 {
    create new class loader
    load derby in class loader
    boot database
    prepare query
    shutdown derby
}

Then time with a reasonable number of iterations. (I think 1 is too few, hence the use of
a class loader).



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